<VV> Corvair compression readings

[James Davis]

Wait a minute.  Compressing a gas will raise the temperature.  Even if 
we figure that the compression is an *adiabatic process* there is still 
a considerable temperature rise.  A 10:1 cr wold raise the temperature 
by 372 degrees centigrade.  Remember diesels?   So 8:1 will give you 
about 135 psi with a 889 cam.  By the way a stock starter won't turn 
over an engine with a 10.7:1  cr  with a mild cam when it is warm.
Jim Davis*
*
Clark Hartzel wrote:
> I have seen readings in the 150/155 pounds range on a 110/140 HP engine.
> But atmospheric pressure is 14.7 PSI x 9.25 compression ratio = 136
> pounds.
> I think we all have inaccurate gauges!  I can't see any stock Corvair
> engine having more than 136 pounds compression and that assumes you have
> no leaks thru the valves or ring gaps and both valves are closed at the
> start of the compression stroke.  Race engines are a different story
> with higher compression ratios.
> Clark Hartzel
>
>